A dual band microstrip antenna (1) has a dielectric substrate (11), a ground plane (10) attached to a bottom surface (111) of the substrate, a first and second radiating patches (21, 22), a first and second conductive posts (23, 24), and a first and second feeder cables (25, 26). The conductive posts each separately elevate a corresponding radiating patch an appropriate height above and parallel to a top surface (110) of the substrate, and electrically connect each radiating patch to the ground plane. feeder inner conductors (250, 260) are soldered to their respective radiating patches and feeder outer conductors (251, 261) are soldered to the ground plane. Impedance matching is achieved by selecting an appropriate distance between the solder positions of the posts and inner conductors on each radiating patch.
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6. A microstrip antenna comprising a dielectric substrate defining opposite top and bottom surfaces thereon, a ground plane formed on one of said top and bottom surfaces of the substrate, at least a radiating patch elevated an appropriate height above and essentially parallel to a top surface of the substrate, at least a conductive post electrically connecting the radiating patch with the ground plane, and at least a feeder cable having an outer conductor electrically connected to the ground plane and an inner conductor passing through the substrate and electrically connected to the radiating patch.
11. A dual band microstrip antenna comprising:
a dielectric substrate defining opposite top and bottom surfaces thereon; a ground plane provided on one of said top and bottom surfaces of said substrate; first and second radiating patches mutually independently elevated from said top surface; and first and second feeder cables respectively connecting to both the corresponding radiating patch and the ground plane; wherein each of said first and second feeder cables extends from the bottom surface through the substrate and beyond the top surface, and includes a top portion located above said top surface and defining an inner conductor surrounded by an outer conductor, said inner conductor connecting to said radiating patch and said outer conductor electrically connecting to said grounding plane.
1. A dual band microstrip antenna, comprising:
a dielectric substrate; a ground plane attached to a bottom surface of the substrate; a first and a second radiating patches each separately elevated an appropriate height above and parallel to a top surface of the substrate; a first and a second conductive posts providing the function of elevating the first and second radiating patches, respectively, above the top surface of the substrate, while also electrically connecting the first and second radiating patches, respectively, with the ground plane; and a first and second feeder cables both including, respectively, a first and second inner conductors, each surrounded by an insulative layer, and a first and second outer conductors covering the insulative layer; wherein the first and second inner conductors are each respectively electrically connected to said first and second radiating patches and the first and second outer conductors are electrically connected to the ground plane.
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The present invention relates to a dual band microstrip antenna.
In a modern office environment, wireless local access networks (WLAN) are more and more common. Such a WLAN usually uses many antennas to transmit and receive data. IEEE 802.11a (5.2 GHz) and IEEE 802.11b (2.4 GHz) are two widely used standards for WLANs. In a WLAN employing the above-mentioned two standards, dual band antennas are needed.
Among the many types of dual band antennas available, microstrip antennas are widely used for their low profiles and good gains, particularly since they are easy to be built into other equipment.
A conventional dual band microstrip antenna is disclosed in U.S. Pat. No. 5,561,435. Referring to
However, the dual band microstrip antenna mentioned above can not work in two different frequency bands at the same time. Additionally, manufacturing the multiple dielectric layers is costly. Furthermore, achieving impedance matching in the two different frequency bands adds to the difficulty of manufacturing.
Hence, an improved dual band microstrip antenna is desired to overcome the above-mentioned shortcomings of existing dual band microstrip antennas.
A primary object, therefore, of the present invention is to provide a dual band microstrip antenna that can work in two different frequency bands at the same time.
Another object of the present invention is to provide a dual band microstrip antenna with a simple structure and low cost.
A dual band microstrip antenna in accordance with the present invention comprises a dielectric substrate, a ground plane attached to a bottom surface of the substrate, a first and second radiating patches separately elevated an appropriate height above and parallel to a top surface of the substrate, a first and second conductive posts respectively elevating the first and second radiating patches above the substrate and electrically connecting the first and second radiating patches with the ground plane, and a first and second feeder cables. Inner conductors and outer conductors of the feeder cables are respectively electrically connected to corresponding radiating patches and to the ground plane.
Other objects, advantages and novel features of the invention will become more apparent from the following detailed description of a preferred embodiment when taken in conjunction with the accompanying drawings. A copending application filed on the same date with the invention titled "METHOD OF MAKING DUAL BAND MICROSTRIP ANTENNA" is referenced hereto.
Reference will now be made in detail to a preferred embodiment of the present invention.
Referring to
In this embodiment, the dielectric substrate 11 is substantially a diamond shape printed circuit board made of FR4 material, namely FR4 PCB. The dielectric substrate 11 has a pair of parallel major surfaces, respectively named a top surface 110 and a bottom surface 111. The ground plane 10 is attached to the bottom surface 111 and is overcoated with a layer of green lacquer, leaving a plurality of tin areas (represented by inclined lines in
The first and second radiating patches 21, 22 are each separately elevated appropriate height above the top surface 110 of the dielectric substrate 11 by the first and second conductive posts 23, 24. Each of the first and second radiating patches 21, 22 is parallel to the top surface 110. A length of the first radiating patch 21 corresponds to a low frequency wavelength scale, and a length of the second radiating patch 22 corresponds to a high frequency wavelength scale, the low and high frequencies being 2.4 GHz and 5.2 GHz, for example. In other words, the length of the first radiating patch 21 is chosen so that the first radiating patch 21 electromagnetically resonates at 2.4 GHz, and the length of the second radiating patch 22 is chosen so that the second radiating patch 22 resonates at 5.2 GHz. The first conductive post 23 is perpendicular to both the first radiating patch 21 and the ground plane 10 and electrically connects them together at soldering points. The second conductive post 24 is perpendicular to both the second radiating patch 22 and the ground plane 10 and electrically connects them together at soldering points.
The first and second feeder cables 25, 26 are each coaxial cables respectively having a first and second inner conductors 250, 260 each surrounded by a dielectric layer (not labeled) which are each surrounded by a respective first and second outer conductor 251, 261. The first outer conductor 251 is soldered to a corresponding tin area on the ground plane 10 while the first inner conductor 250 passes through the dielectric substrate 11 and is soldered to the first radiating patch 21. The second outer conductor 261 is soldered to a corresponding tin area on the ground plane 10 while the second inner conductor 260 also passes through the dielectric substrate 11 and is soldered to the second radiating patch 22.
Particularly referring to
The dual band microstrip antenna 1 is simple in design, is easy and inexpensive to manufacture, and can operate in two different frequency bands at the same time.
It is to be understood, however, that even though numerous characteristics and advantages of the present invention have been set forth in the foregoing description, together with details of the structure and function of the invention, the disclosure is illustrative only, and changes may be made in detail, especially in matters of shape, size, and arrangement of parts within the principles of the invention to the full extent indicated by the broad general meaning of the terms in which the appended claims are expressed.
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